: being or relating to a clinical trial in which the treatment given to each subject is not concealed from either the researchers or the subject
an open-label multicenter study
compare double-blind, single-blind

Examples of open-label in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
So far, the growing body of study into open-label placebos has revealed positive effects in patients with back pain, nausea, IBS and migraine. New Atlas, 22 Feb. 2025 Cannabidiol in patients with treatment-resistant epilepsy: an open-label interventional trial. Matt Rozo, The Mercury News, 6 Jan. 2025

Word History

First Known Use

1979, in the meaning defined above

Time Traveler
The first known use of open-label was in 1979

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Cite this Entry

“Open-label.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/open-label. Accessed 27 Mar. 2025.

Medical Definition

open-label

adjective
: being or relating to a clinical trial in which the treatment given to each subject is not concealed from either the researchers or the subject
long-term open-label studies
compare double-blind, single-blind
Last Updated: - Updated example sentences
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